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Sludge thermochemical treatment
An introduction to sludge thermochemical treatment methods
Pyrolysis
Pyrolysis is the decomposition of organic matter at elevated temperatures (300 and 1300 °C) in the absence of oxygen at atmospheric pressures. The useful products generated are a charcoal-like biochar solid product, a bio-oil formed from ‘condensable’ volatile substances and ‘non-condensable’ gases which may include both carbon dioxide and methane.
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Sludge thermochemical treatment − an overview
Thermochemical methods are used for either degrading the sludge solids or pre-treating sludge upstream of anaerobic digestion
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Sludge thermochemical reactor design configurations
Various reactor configurations exist for sludge thermochemical treatment which vary in design, operation and application
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Non-oxidative thermochemical treatment
An introduction to non-oxidative sludge thermochemical treatment methods
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Sludge treatment − pyrolysis
Pyrolysis refers to the decomposition of organic matter at elevated temperatures in the absence of oxygen and water
Pyrolysis related videos
Benenv's products and services for wastewater and sludge treatment − a showcase
A showcase for Jiangsu Benenv Environmental Protection Co., Ltd's products and services for wastewater and sludge treatment.
Products include the elliptical Wave Separator and the Multi Disk Screw Press for sludge dewatering, the super sludge dryer, and the sludge carbonization furnace. Services include process design, and equipment supply and installation.
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Pyrolysis features and blogs
Feature
Co-processing of sewage digestate by hydrothermal carbonisation
Hydrothermal carbonisation (HTC) can be used to co-process anaerobic digestion (AD) digestate and lignocellulosic (or plant-based) feedstocks to improve the the hydrochar product quality. This AD waste co-processing route has been studied at bench scale. Read article
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Gasification
Gasification is conversion at very high temperatures in a partial reducing atmosphere to generate a syngas product
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Thermal hydrolysis processes
Hydrothermal processes employ elevated temperatures and pressures in wet conditions and in the absence of oxygen
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Hydrothermal carbonisation
Hydrothermal carbonisation converts sludge predominantly into a hydrochar solid product at temperatures of 180-300 °C
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Hydrothermal liquefaction
Hydrothermal liquefaction of sewage sludge takes place at temperatures of 250–400 °C and pressures above 40 bar
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Hydrothermal gasification
Hydrothermal gasification converts sludge to a hydrogen and/or methane-rich gas stream at temperatures up to ~550 °C
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Thermal destruction - oxidative
Oxidative methods for sludge thermal treatment comprise incineration, wet air oxidation and supercritical water oxidation
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Thermal destruction - non-oxidative
Non-oxidative thermochemical treatment of sewage sludge refers to treatment at elevated temperatures in the absence of oxygen
More process and operation topics…
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Thickening, dewatering & drying
Thickening, dewatering and drying extract water from sludge to reduce the sludge volume
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Sludge stabilisation
Sludge stabilisation − alkaline stabilisation, lime and solids dosing, plus anaerobic and aerobic digestion
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Sludge quality
Sludge is the main waste stream from the treatment of wastewater